ML20066K736

Forwards LERs 82-129/03L-0 & 82-130/03L-0.Detailed Event Analyses Submitted

ML20066K736
Person / Time
Site:	San Onofre
Issue date:	11/17/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20066K742	List: ML20066K736
References
NUDOCS 8211290638
Download: ML20066K736 (2)

Text

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. " tL9c Southern California Eo'ison Comppny, c;CE S AN ONOPRE NUC L E AR GENER A TING S T A TION P .O. B O X 12, S A N C LEMEN T E. C A LIF OR Nia ,2672 k*,

H. B. R A Y November 17, 1982 ' " ' ' * " " "

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. R. H. Engelken, Regional Administrator

Subject:

Docket No. 50-361 30-Day Reports Licensee Event Report Nos: 82-129 and 82-130 San Onofre Nu lear Generating Station, Unit 2

Reference:

Letters, H. B. Ray (SCE) to R. H. Engelken (NRC),

dated October 21, 1982, October 8,1982, September 24, 1982, August 27, 1982 and August 13, 1982.

The referenced letters transmitted 30-day written reports and Licensee Event Reports (LER's) for occurrences involving the Condensate Storage Tank T-121 low water level. As noted in those letters, violations of Technical Specification 3.7.1.3 continue to occur. A Technical Specification change was approved on October 26, 1982, by the NRC which will alleviate this problem.

Pursuant to Section 6.9.1.13b of Appendix A, Technical Specifications to Operating License NPF-10, for San Onofre Unit 2, this submittal provides the requimd 30-day written report and copy of LER's for two occurrences similar to those described in the referenced letters.

Limiting Condition for Operation (LCO) 3.7.1.3 requires that while in Modes 1-3, the Condensate Storage Tank T-121 must be operable with a contained volume of at least 144,000 gallons. The associated Action Statement requires that with the tank inoperable, it must be returned to operable status within four hours or be in at least hot shutdown (Mode

4) within the following six hours. The Surveillance Requirement 4.7.1.3 requires verification of the contained water volume at least once each 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

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Mr. R. II. Engelken November 17, 1982 On October 20, 1982, with the plant in Mode 3, while feeding the steam generators using the Auxiliary Feedwater Pumps, the water level in Tank T-121 fell below the allowable limit. This tank has its overflow set about 5,000 gallons above the Technical Specification limit of 144,000 gallons. Thus, prompt operator action is required to prevent entering the LCO Action Statement.

The cause and corrective action of these events were identified in the referenced letters and remain unchanged. It should be noted that modifications have been made to the level indications available to the operators to facilitate precise control.

The viciations of Technical Specification 3./.1.3 occurred again on October 21, 1982, notwithstanding the very best efforts of the operators to maintain tank level within the 5,000 gallons deadband. Enclosed LER's82-129 and 82-130 address the occurrences of October 20 and 21, 1982 respectively. With the approval of the Technical Specification change, this type of event should not occur in the future.

If there are any questions, please contact me.

Sincerely,

Enclosures:

LER's82-130 and 82-129.

cc: A. E. Chaffee (USNRC Resident Inspector, San Onofre Unit 2)

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Office of Management Information and Program Control Institute of Nuclear Power Operations

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